I think the big issue is that developers have a problem to support Mojave and the silicon systems at the same time...
and they don't want to spend more time and money on it than necessary...
Nikon or any other company has as much right to innovate as Apple and Adobe does...
In this case Nikon wanted to have a smaller NEF to accommodate the 20 frames/second shooters that we find alongside the sportsfields (to be able to go from 20MP to 45MP)
So anyway i have to say goodbye to old but good ( even better) 32bit software and move on.
Adobe can change the 8? years old text into;
"you need OSX 10.15 to use the DNG converter and get support for the cameras introduced later than 2020"
And how far back should this support go, to Photoshop 7 when ACR was introduced, in 2003?
the DNG converter...
between 2003 and 2018 Mojave is 15 years... i think 10 years would be OK to keep everybody happy...so 2012- 10.8 Mountain Lion
Than you can still use the CS6 programs that run with 10.11 (2015) with the latest camera's because of DNG support.
That would be nice.